| 摘要 |
PURPOSE: A semiconductor device is provided to stably operate a Wilson circuit or a reference voltage generation circuit as a current source circuit when a low source voltage is utilized. CONSTITUTION: A memory chip(10) includes a power-on reset(POR) signal generator(11), a memory cell array(12) and a peripheral circuit(13) for controlling the memory cell array(12). In a semiconductor memory, for example, let VCC be the power supply voltage, VLGC be the power supply voltage at which logic circuits such as flip-flops start operating, VALG be the power supply voltage at which analog circuits start operating, and VCCmin be the lower limit of the power supply voltage VCC determined from specifications. In this case, a power-on monitoring level Vpo which is the value of the power supply voltage VCC at which the power-on reset signal changes from "L" to "H" must satisfy max(VLGC,VALG). When the power supply voltage VCC further rises to be higher than the second monitoring level Vpo2, the VCC monitor monitors it and changes the power-on reset signal POR to "H". When the signal POR changes to "H", the operation of the oscillator stops, and the VINT node and VCC node are short-circuited by the VINT-VCC shorting circuit.
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